Mushroom-bullet.



T. G. JOHNSON.

MUSHROOM BULLET.

APPLICATION FILED SEPT. 13, 1913.

1,080,97 6. Patented Dec. 9, 1913.

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THOMAS C. JOHNSON, OF NEW HAVEN, CONNECTICUT, ASSIGNOR T0 WINCHESTERREPEATING ARMS CO, OFNEW HAVENQCONNECTICUT, A CORPORATION.

, MUSHROOM-BULLET.

Specification of Letters Patent.

Patented Dec. 9,1913.

Application filed September 13, 1913. Serial No. 789,603.

To all whom it may concern: 7

Be it known that I, THOMAS C. JOHNSON, a citizen of the United States,residing. at Newliaven, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement in Mushroom-Bullets; and I do hereby declare the following, when taken in connectionwith the accompanying drawings and the characters of reference markedthereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this application, and represent,in-

Figure 1, a view in side elevation of a mushroom bullet constructed inaccordance with my invention, a portion of the jacket being broken awaytoexpose the core which is shown in section. Fig. 2, a correspondingview of a modified form which the invention may assume.

My invention relates to an improvement in mushroom bullets of the classin which a soft metal core is inclosed in a relatively hard sheet-metaljacket, the object being to produce a bullet of superior performance inthe matter of mushrooming.

In carrying out my invention as shown in Fig. 1, the one-piecesheet-metal jacket is virtually divided into a tip, 2, and a body, 3, bythe formation of a downwardlypitched circumferential groove, 4, by whichthe metal of the-jacket is stretched and reduced in thickness and thusweakened. The head, 5, thus formed upon the inside of the jacket is, ofcourse, embedded in the soft ,metal, 6, of the core which is entirelyinclosed by the said jacket. By preference the jacket will be grooved asdescribed preparatory to the swaging operation though that is notessential to my invention. I conceive that the groove may be partlyformed before the swaging operation and partly formed during the same.The said circumferential groove 4 is located in the tapered forward endof the bullet well be- 7 yond the point where the cylindrical portionthereof merges into the tapering portion thereof. At the time of impact,the jacket breaks down where so weakened, and so much of the core as iscontained within the tip is jammed down into the main body of the bulletwith the effect of disrupting and mushrooming the same.

In the construction shown by Fig. 2, the sheet-metal jacket is virtuallydivided into a tip, 2, and a body, 3, by means of a circumferential bandof downwardly extending indentations, 7, which stretch and weaken themetal of the jacket and prepare it to be broken on the impact of thebullet,

I claim v 1. A sharp-nosed mushroom bullet having a soft metal core, anda sheet-metal jacket entirely inclosing the said core,

tapered at its forward end to a point and formed in its tapering forwardportion with a downwardly inclined indentation struck from the outsideof the jacket and entering the core and weakening the jacket so that itbreaks downin the neighborhood of the indentation.

2. A sharp-nosed mushroom bullet having a soft metal core, and asheet-metal jacket entirely inclosing the said core, tapered at itsforward end to a point and formed in its tapered forward portion with acircumferential downwardly inclined groove extending into the soft metalcore of the bullet, the metal of the jacket being stretched and weakenedin the groove, whereby it initially breaks down in the neighborhood ofthe groove and facilitates the mushrooming of the bullet.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

THOMAS C. JOHNSON. lVitnesses:

' HARVEY W. GRoEsBnoK,

HARRYL. ORooKE'r'r.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

